CANVAS WRITE TEXT ON IMAGE HOW TO
CANVAS WRITE TEXT ON IMAGE PDF

The pagesize is actually a tuple of width and height in points. Here you can see that you can pass in the pagesize as an argument. Now you are ready to look at the Canvas‘s constructor to see what it takes for arguments: def _init_(self,filename, There are some common page sizes that can be found in. This is in contrast to creating a user interface in a Python GUI framework like Tkinter or wxPython where to origin is the top left.Īlso note that since you didn’t specify page size, it defaults to whatever is in the ReportLab config, which is usually A4. So when you told ReportLab to paint your text, you are telling it to start painting 100 points from the left-hand side and 100 points from the bottom. The reason for this is that the origin, (0,0), is the bottom left corner of the document. What you might notice is that your text is near the bottom of the document.

CANVAS WRITE TEXT ON IMAGE PDF

Now you can open it up and see what our PDF looks like: Finally, you call the canvas object’s save() method, which saves the document to disk. If you draw another string or some other element after calling showPage(), that object will be drawn to a new page. The s howPage() method also ends the current page. It’s actually not required, but it is recommended. The showPage() method will save the current page of the canvas. Next, you call drawString() on your canvas object and tell it to start drawing the string 100 points to the right of the origin and 100 points up. You will note that the only required argument is a filename or path. In this example, you import the canvas object and then instantiate a Canvas object. Let’s import it and paint some text: # hello_reportlab.pyĬ.drawString(100, 100, 'Welcome to Reportlab!') The canvas object lives in the pdfgen package. At this point, you’re ready to create a PDF! The Canvas Object This information will help you position your drawings on your painting. Let’s find out how many points are in an inch and a millimeter, respectively: > from import inch Here you learn that a letter is 612 points wide and 792 points high. Points! Let’s take a look at how many points are on a letter-sized page: > from import letter It’s points, not pixels or millimeters or inches.

The other item that you need to know is that when you are positioning an item in a PDF, you are positioning by the number of points you are from the origin.

This allows for very precise placement of the elements that you are adding to the page. You can place buttons absolutely in many of these kits using X/Y coordinates as well. Many desktop user interface kits, such as wxPython, Tkinter, etc, also have this concept. The default is (0,0) whose origin is at the lowest left corner of the page. When you go to paint on your canvas, you will need to specify X/Y coordinates that tell ReportLab where to start painting. The canvas gets imported from the pdfgen package. You will be drawing or “painting” on a canvas to create your PDF.

CANVAS WRITE TEXT ON IMAGE HOW TO

You will discover how to do the following: In this tutorial, you will be learning how to use ReportLab’s pdfgen package. I have used it to replicate many complex page layouts over the years. With a little effort, you can make pretty much any layout that you can think of.

Canvas write text on image